Analysis of packing factors of crystalline polymers in terms of the glass transition to melting temperature radio |
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Authors: | Yu. I. Matveev |
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Affiliation: | (1) Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991, Russia |
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Abstract: | An expression for the ratio of the glass transition temperature to the melting temperature, T g/T m, was derived with allowance for fluctuations of the packing factor in the amorphous state. This relationship made it possible to describe the actual range of variation in T g/T m depending on a change in the packing factor in the crystalline state k o, cr. The proposed approach forms the basis for the method of determination of increments in the packing ratio k o, cr and formulation of the principles of selection of experimental data for calculations. The glass transition temperatures in polyethylene depending on the type of unit cell were calculated. |
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